Industrial Heat Transfer Fluids
Ethylene or propylene glycol-based industrial heat transfer fluids/coolants and subsea water-glycol hydraulic control fluids are extensively used in the Oil & Gas Industry. These critical fluids are replaced when cleanliness and formulation chemistry can no longer provide the desired optimum performance.
The EET Corporation Coolant Recycling System (CRS) is a multi-step process that recovers and purifies glycol base fluids that are indistinguishable from virgin products. The process removes contaminants and residual corrosion inhibitors typically found in used industrial coolants as shown in Table 1. The process may be used at fixed centralized location to service the needs of the O&G Industry, or mobile systems can be used to allow service at different sites as needed. A simplified diagram of the process is illustrated in Fig. 6 below.
Table 1
CRS Process Removal Effectiveness
| Compound | Pretreated Used Coolant | Product | Overall Removal (%) |
| Total Glycol Degradation Acids (ppm) | 994 | 1 | 100.0% |
| Chloride (ppm) | 73 | 1 | 99.0% |
| Sodium Nitrite (ppm) | 178 | 1 | 99.7% |
| Sodium Nitrate (ppm) | 1,014 | 1 | 100.0% |
| Sodium Phosphate (ppm) | 1,523 | 1 | 99.9% |
| Sulfate (ppm) | 411 | 1 | 99.7% |
| Sodium Molybdate (ppm) | 293 | 1 | 99.8% |
| Sodium Tetraborate (ppm) | 553 | 142 | 77.5% |
| Tolyltriazole (ppm) | 22 | 0 | 100.0% |
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